Make nova-multi-cell job voting and gating
Make nova-multi-cell job voting and gating

Compared to tempest-full-py3 and tempest-slow-py3
the nova-multi-cell job has been relatively stable
for the past couple of months so let's make it voting
so we don't regress multi-cell functionality.

Change-Id: I11081177abfe2fb69fbd8fc17464c9f08962ab4c

rahulunair/nova,klmitch/nova,rahulunair/nova,klmitch/nova,rahulunair/nova,openstack/nova,mahak/nova,openstack/nova,klmitch/nova,klmitch/nova,mahak/nova,openstack/nova,mahak/nova